Crown D-150A - Crown D-150 A Service Manual Review; Introduction to D-150 A Service Manual; Crown D-150 A Warranty and Service Policies; D-150 A Technical Specifications Overview

crown
REVIEW
SECTION
I.
Introduction
This
manual
contains
complete
service
information
on
the
D-
1
50A.
It
is
designed
to
be
used
in
conjunction
with
the
D-
1 50
A
Instruction
Manual.
However,
some
important
information
is
duplicated
in
this
Service
Manual
in
case
the
Instruction
Manual
is
not
readily
available.
NOTE:
THE
INFORMATION
IN
THIS
MANUAL
IS
INTENDED
FOR
USE
BY
AN
EXPERIENCED
TECHNICIAN
ONLY!
II.
Warranty
As a
Crown
Warranty
Service
Station,
you
should
be
familiar
with
Crown
warranty
policies.
Each
Instruction
Manual
contains
basic
policies
as
related
to
the
customer.
However,
under
questionable
circumstances,
please
contact
the
Technical
Service
Department
or
Director
of
Customer
Service
at:
Crown
International,
Inc.,
1718
W.
Mishawaka
Road,
Elkhart,
IN
46517.
III.
Specifications
General
Specifications
Hum
and
Noise
(20Hz-20KHz):
HOdB
below
rated
output.
Phase
Response:
+0,
-15°, DC-20KHz
at
1
watt.
Input
Impedance:
25K
ohms,
±3%.
Amplifier
Output
Protection:
Short,
mismatch,
and
open
circuit
proof.
Limiting
is
instantaneous
with
no
flyback
pulses,
thumps,
cutouts,
etc.
No
premature
limiting
on
transients.
Overall
Protection:
AC
line
fused.
Thermal
switch
in
AC
line
protects
against
overheating
caused
by
insufficient
ventilation.
Controlled
slewing-rate
voltage
amplifiers
protect
overall
amplifier
against
RF
burnouts.
Input
overload
protection
is
furnished
by
internal
resistance
at
inputs
of
amp.
DC
Output
Offset
(Shorted
Input):
10
millivolts
or
less,
internally
adjustable
to
zero.
Turn-On:
Instantaneous,
with
minimum
thumps
and
no
program
delay.
Circuit:
Wideband
multiple
feedback
loop
design
utilizing
one
linear
IC
(dual
op-amp),
total
equivalent
of
48
transistors,
22
signal
diodes,
3
zener
diodes,
and
6
rectifier
diodes.
Power
Supply:
Massive
computer-grade
filter
capacitors
store
over
20
joules
of
energy.
Two
regulated
supplies
for
complete
isolation
and
stability.
Power
Requirements:
Requires
50-400Hz
AC
on H)0,
200,
220,
or
240V
±10%
operation.
Draws 30
watts
or
less
on
idle,
250
watts
at
160
watts
total
output.
Heat
Sinking:
The
entire
amplifier
is
used
as
a
heat
sink.
3/16
inch
thick
chassis
acts
as
a
heat
sink
along
with
auxiliary
fins.
Chassis:
All
aluminum
construction
for
maximum
heat
conduction
and
minimum
weight.
Controls:
Independent
level
controls
are
mounted
on
the
front
panel.
Power
switch
with
associated
pilot
light
is
on
front
panel.
Non-interacting
DC
balance
controls
are
mounted
on
main
PC
board
under
electronics
cover.
A
mono-stereo
switch
is
located
next to
the
input
jacks
on
the
rear
panel.
Connectors:
Input
-
'A
inch
phone
jacks,
output
-
color
coded
binding
posts,
AC
line
-
3-wire
(grounded)
male
connector
on
5
foot
minimum
cable.
Dimensions:
17
inches
(43.18cm)
long,
5!4
inches
(13.34cm)
high,
8%
inches
(22.23cm)
deep
(from
mounting
surface
of
front
panel),
19
inches
(48.26cm)
long
with
standard
rack
mounting
brackets
installed.
Weight:
24
pounds.
Finish:
Satinized
aluminum
front
panel
with gray
suede
Lexan
insert.